Magnetic disk apparatus

Details Magnetic disk apparatus Magnetic disk apparatus

1989-07-14

1991-01-08

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Address coding

360 40, 360 78140, G11B 509

Patent

active

049841009

ABSTRACT:
A method of forming servo information in a magnetic disk apparatus of a sector servo system. Servo information is recorded in advance at the beginning of each of the sectors, and includes a DC erase signal, a track address signal and a burst signal. The track address signal indicates on which track of the magnetic disk the sector is located, and is formed by expressing the track address in Gray code and interleaving a dummy code into the Gray code. Servo information is recorded using an NRZI system or an RLL coding method. Servo information in which the dummy code is interleaved is decoded after the dummy code is removed at the time of demodulation.

REFERENCES:
patent: 4823212 (1989-04-01), Khowles et al.
patent: 4910617 (1990-03-01), Brunnett et al.
patent: 4920462 (1990-04-01), Couse et al.

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